Issue around display size for aml-s905x-cc-android-7-1-preview-1.img

Currently running Android on Le Potato and everything seems to be working well for my main use as an HTC. However, I need to go into settings after each reboot to adjust display size down to 90% on Sony Bravia KDL55W800 TV.

hmm, after settings/display/ my only options are Screen resolution, Screen position, HDR to SDR & SDR to HDR. There is no HDMI option and the resolution in screen resolution only has the usual 1080p, 720p etc.